Cook 2 diced peeled rutabagas in boiling salted water until tender, 20 to 25 minutes; drain and return to the pot over low heat. Meanwhile, cook 2 slices chopped bacon in a skillet until crisp; add the drippings to the rutabaga along with 1/2 cup milk and 2 tablespoons olive oil. Mash well. Season with salt and pepper. Top with the bacon and chives.